Drill chuck



that the adjustment of the parts of thev .CARL A.. LLMGREN, 03? CHECAG, 'ILLINOIS DRlLL CHUCK.

Specitcation Leiters tslwt' epplcaton filed August 28, 1919. Serial No. 320,501.

To @ZZ whom 'it may concern Be it known that l, Cain", A.. limmnnn, a citizen ci? the Unit d residing at "(1362 South -Shore ^Avenue, Chicago, in thecounty of @ook and State oit illinois, have invented a new and useiul improvement in Drill Chucks, of which the following is a speciication.

My object, generally stated, is to provide improvements in chucks to the end that the desired rigid clamping of the drill in the chuck may be effected, the length or the chuck materially reduced over those as heretofore provided, and that the number or" parts forming the chuck shall. be reduced;

chuck for clamping drills therein and releasing them, may be quickly el'lected; that the chuclr shall be capable of receiving and holding drills of relatively widely varying sizes compared with the sise of the chuck; y

and other objects as will be manifest from the following description:

`Referring to the accompanying drawings, Figure 1 is a view in elevation or a chuck constructed in accordance with my invenion, showing a drill, Vpartly breiten away, in position therein. Figure 2 is a similar view showing the adjustable outer sleeve, or shell, in section. Figure 3 is a. sectional 'view of the outer sleeve of the chuclr. Figure L1 is an end view or' the chuck, with the tool removed. Figure 5 is an enlarged view, partly brolren, in longitudinal. sectional eletion, oit the chuck, showingdrill secured therein. Figure 6 is a view in side elevation, and Figure i' a perspective view, ol? certain details ol the jaw-operating mei-.hausm of the chuck. lfigures 8 and 9 are sections taken. at the lines 8MS andQ-S), respectively, on lllig. 5 and viewed in the direction ot the arrows; and `Fig. 10, a broken view in elevation ol the member in which the aws of the chuclr are guidingly conlined.

The headof the chuck is represented at 11, this part being of circular shape in cross section and having` a stem 12 preferably formed separately from the head `11, and having drive lit in a soclret 13 in the upper end of the latter, this stem being` adapted to be inserted into the soclret usually provided in drill presses. The opposed end of the head 11 is of truste-conical form as represented at 15, this end of the head being centrally recessed to form a socket 1l which extends inwardly beyond the base of thev portion 15 of the head, the latter being slotted radially, as indicated at 16, three ot' these slots being provided in the particular construction illustrated and the portions 'oil' these slots adjacent the base of the portion l5 being of reduced width as -represented at 17. The outer enlarged portions 18 or' the slots 16 contain the drill-clamping jaws of the chuck which are provided or any desired number, three being shown in the construction illustrated, the number of slots 16 corresponding with the number of j aws. The jaws referred to and which are provided of a width slightly greater than the width of the portions 1"? of the slots, and slightly narrower than the portions 18 of these slots, are represented at 19 and are preferably of the shape shown, namely oit general triangular shape, the drill engaging edges 2O thereof extending parallel with each other and parallel with the median line of the chuck, the surfaces 21 at their upper edges extending preferably at right angles to the surfaces 20, and the inclined surfaces 22 being inclined relative to the` median line or the chuck at the same angle as the truste-conical surface 15. The outer end of the portion 15 oic the head 11 is peripherally grooved, as indicated at 23, for receiving a spring member 24- in the iorm ot a split ring 2l formed of spring wire which entends through openings 25 in the jaws 19 and serves, under its spring` tension, to move the jaws outwardly in the guides 15 to a condition in which the chuck is expanded, the ends ol2 the member being preferably dell. "flied outwardly as represented at 9.6, to prevent disengagement ol the jaws there trom when the parts ofthe chuck are in disassembled. condition.

lhe head 11 is surroiuuled by an outer sleeve, or shell, 2"? which comprises a erally cylindrical portion 28 at which it encircles the body of the head, and a trusteconical portion 29 at whichfit encircles the Crusto-conical portion 16 of the head, the inner surface of the part 29 being tapered to correspond with the taper ot the part 15 and the edges 22 of the jaws 19, whereby upon shitting the sleeve 28 upwardly on the head 11 it will force the jaws 19 inwardly, toward each other, to grip at the edges 20,

the drill inserted into the space between these jaws, as for example as shown oit the drill 31, especially 1n F 1g. 9. ln the c0nstruction shown'the relative movement ot thel sleeve 28 and head 11 'for the purpose stated is effected by means or the provision fof a spirally extending groove 31 provided tion or the shell 28 about thev head 11. it

will be understood that by this'arrangement the Hthreaded connection between the vhead and the shell may be oi' relatively wide pitch,

and thus by' a single rotation of the sleeve 28 the latter may be given relatively great movement lengthwise of the head 11 and relative to the latter, thereby permitting the operator to quickly clamp drills ror widely varying sizes, in the chuck andquickly dis- V Y 3,30 orrthe sleeve 29and thereby becoming `tightly gripped tothe tool 3L From the engage them from the latter.

Cooperating with the means for drawingthe jaws 19 together and for clamping a drill vin place in the chuck, are meanswhichoperate automatically7 in case the drill,rin the drilling operation, slips in the chuck and thus exerts an upward thrust, to cause the grip oit the jaw on the fdrill to `be automatically augmented for clamping the ldrill suliiciently tight in the ,l chuck to prevent'slippage, a description ot these means, in accordancewith the preferred, illustrated,` embodiment oi'l my invention being as follows I' `Reciprocably confined in the recess 14: is a plungerBQL normallyoutwardly springpressed by a coiled spring 33a confined between vthe plunger 32@ and the inner end lof the'v socket 1`1, this plunger. being held in `the socket .by means of a screw S/i screwed into the bodyll` and extending at its inner end into a position in which it opposes the flat side 35 of the j ilun'ger formed by cutting away a portion of the periphery ot the latter between the ends oi the plunger, thereby affording a shoulder 36.v Cooperating with the plungeiBQ, is a series of rock members 37 formed with substantially circular heads 38 connected with the body portions 39 of the rock members, by ne`ckst0,the members 37 being rprovided or the same number as the jaws 19 `and being confined, to rock, "at their` heads 38m a peripheral groove 4:1 in the outer end of the plunger 39fkthev walls ol the groove 11 beingperipherally undercut as represented, in order that the members .37 may, when introduced into the4 groove Ll1 atthe flat portion 35 oil: the plunger, intein.

lockt-herewith against accidental separation therefrom, but;maintain rocking engage` ment betweenv these parts. The members-37 are locatedy between the inner surf-aces 21` the latter to rock on the plungery 32? and j ust 'described A `j aws on the tool.

or the jaws 19 and the bases'll-Q of the recesses`16, the members 3( by pre-ference, be ing oil such shape and dimensions, as shown,

that in the position of theA parts shown in Figi. 5, themenibers 37 `will extend from the -base' of the portions 17 ofthe slot 16, tothe sult off movingthevlatter inwardly, thereby shifting the heads 38 oi the-members 37' likewise inwardly with the result of causing therebyl exert. by a cammingaetion, 'pres'- sure against the inner ends ot the jaws 19 in a direction 'to-force the latter outwardly, the latter sliding against the taperec surface y ioiegoing it will be' understood that the" chuck furnishes means operating automatically to immediately tighten the gig-ip oi' the chuck on the tool to lprevent the turningot invention, is that of being` ableto j irovide the chuck a relativelysliort structure, in-` asniuch yas the length 0i' tliefgripping sur# faces or the jaws 19 need not be nearly so long, as in the case ot ai structure wherein-` the automatic gripping 'feature is lacking.

ldlhileqlf,y have illustrated .de particular construction einbodyin intending-to limit it thereto as thesame may Abe variously niodiiied and altered without (leparting lfroni the spirit ot my invention,

itbeing my' intention. to claim `my invention as 'fully and completely astlie prior the art will permit.

l claim:

state ot i iis4 scribed a.y Y

f inyiny fvention, l. do not wishfto be. und stood as 1. A chuck comprising,,v in'scombination,

awedgesurface and operating, when shifted vandshift the `latter into clamping engagement with a tool `Iinserted intothe chuck,

vagainst said wedge` ysurface for forcing the a body member', tool-,clampino 1awsthereon, r fan element on said'body member' presenting l 2 yonsaid body` member, to engage said 'jaws jaws inwardly. to tighten the grip r,of the 2. A chuck comprising, in combination,

jaws toward the outer end of the chuckv causing the jaws to tighten their grip on the tool.

3. A chuck comprising, in combination,

a body member, tool-clamping jaws thereon, an element on said body member presenting a wedge surface and operating, when-shifted on said body member, to engage said jaws and shift the latter into clamping vengagement with a tool insertedfinto the chuck, and a series of movable membersv disconnected from said jaws and actuated by the tool in moving inwardly and adapted, when actuated, to force said jaws into tight engagement with the tool. f

e. A chuck comprising, in combination, a body member, tool-clamping jaws thereon, means for shifting said jawsv into clamping engagement with a tool inserted into the chuck, a movable member adapted, when actuated, to force said jaws toward the outer end of the chuck and into tight engagement with the tool, and a second member actuatedA by the tool in moving inwardly and operating, able member.

5. A chuck comprising, in combination, a body member, tool-clamping jaws thereon,

means for shifting said jaws into clampingr engagement with a tool inserted into the chuck, a plunger operated by the ltool in moving inwardly "in the chuck, and means operatedk by said plunger in its inward movement for forcingsaid jaws toward the outer end of the chuck into-clamping engagement with the tool.

6. A chuck comprising, in combination,y

a body member, tool-clamping jaws thereon, means yfor shifting said jaws into clamping engagement with a tool inserted into the chuck, a plunger operated by the tool in moving. inwardly in the chuck, a spring tending to force said plunger toward said jaws, and means operated by said plunger for forcing said jaws toward the outer end of said chuck and into clamping engagement with the tool.

7. A chuck comprising, in combination, a body member, toolclamping jaws thereon, means for shifting said jaws into clamping engagement with a tool inserted into the chuck, a plunger operated by the tool in moving inwardly in the chuck, and members having pivotal connection with said plunger and operating, when said plunger is actuated, to force said jaws toward the outer end of said chuck into clamping engagement with the tool.

S. A chuck comprising, in combination,

when actuated, to actuate said movf a body member having an open end containing' radially-disposed slots,jaws in said slots, ashell on said body member presenting an internal wedge-surface adaptedto engage said jaws and force them toward the center of the chuck when said shell ismoved4 along said body member, a plunger in said body member adapted'to be forced inwardly by inv-.iard movement of the tool in the chuck, and a series of rock-members interposed between the inner ends of said'jaws and portions ofsaid body-member andv engaging said plunger and opei'rating4 when said plunger is moved inwardly by` the tool to lforce said jaws in an outward direction against the wedgev surface of said shell.

9. A' chuck comprising, in combination, a body member, tool-clamping jaws thereon,` a movable element on said body member presenting a wedge surface and operating, .s

when shifted on said body member, to. engage said jaws and shift the latterintc clamping engagement with a tool inserted into the chuck, a plunger actuated by they tool in movingl inwardly in the chuck, and means actuated by said plunger for moving said jaws toward the outer end of the chuck and against said wedge surface for causing` the jaws to tighten their grip on the tool.

l0. LA i chuck comprising, in combination, a bodyfmember, tool-clamping jaws thereon, a movable Lelement on said body member presenting 'a wedge surface and operating, when shifted on said'body member', to engage said jaws and shift the latter into `clamping engagement with a tool inserted into the chuck, a plunger actuated by the tool in moving inwardly in the chuck, and members disconnectedv fromA said jaws and operated byV said plunger in its inward movement and forcing said jawsA against said wedge surface and into clamping engagement with the tool. l Y 1l. A chuck comprising, in combination, av body member, toolclamping jaws thereon, a movable element on said body member presenting a wedge surface and operating,

when shifted on said body member, to ensaid jaws and shift thelatter :into

clamping vengagement with a tool inserted' into the chuck, a plunger actuated bythe tool in moving inwardly in the chuck, andy members disconnected from said jaws and ada ted to be forced toward the outer end of the chuck, by said plunger, in the inward movement of the latter, for forcing said jaws into clamping engagement with the tool.

l2. A. chuck comprising, in combination, a body member, tool-clamping jaws thereon, a movableelement on said body member presenting a wedge surface and operating, when shifted on said body member, to engage said jaws and shift the latter' into clamping engagement with a tool inserted into the chuck,

Ein

llO

' a plunger actuated by the ltool in. moving ment with the tool.

inwardly in the chuck, aspri'ng tending to force said plunger toward said jaws, and means disconnectedl from said `jaws and adapted to be .forced against said jaws by saidplunger for forcing `said jaws intoA clamping engagement'withthe tool.

Q13.. A chuck comprising, vin' combination, a body member, toolclampiiigjaws thereon,

a movable element on said body member presentinga wedge surface and operating, when shifted on said body member, to engage said j'awsaiid shift the latter into clamping engagementlwitha tool inserted into the chuck,

a plunger actuated bythe tool in moving inwardly -in thev chuck,-a spring tending to force said plunger toward saidjaws, and

.means disconnected from saidejaws and "adapted to be forced toward the outer end.

ef-V the .chuck and against said jaws in the vfaction of said plunger in moving inwardly,

for forcing said jaws into clamping engage- 14. A `chuck comprising, in arbody member, tool-clamping jaws thereon, @movable element on said bodymember presenting a wedge surface and operating, when shifted onfsaid body member, to engage .said jaws and shift'the latter into clampinggengagement with a tool inserted into the chuck, plungerl actuated by the tool 'i-n moving. in-

wardly in the chuck, andrmembers disconnected from said jaws and. having vpivotalv connection 'wtlisaid plunger and adapted to be forced toward the outer end of thechuclr by said plunger when the latter is actuated, for forcing said jaws into .clamping engage' ment with the tool.

W15. A chuck.comp-rising,fiii combination,

a bodymember', tool-clamping'jaws thereon,-

a member adapted `to be'shifted lon said body memberkgand ope-rating toshift l said jaws into clamping engagementy with toolin-y serted into the chuck,.a movable member 'ac -i tuated bythe tool in moving inwardly, andv a fourth ymember operatively. engaging said movable member and shiftable by theI latter, n" `said fourtlrmember being located between,

and engaging, said body member and said jaws, and when said movable member vis moved inwardly, operating to force saidA j awstoward thek outer end of the y,chuck and wedge surface. for shiftin combination,

Iagainst said second-,named `meinber .for

shiftingsaid thel chuck;v 16.' A chuck -coriiprisin'C jawstoward ythe median line of iii combination, l

a body member, tool-clamping jaws thereon,"

a member adapted to be shifted' ovnsaid'body meinber and having a wedge vsurface engaging said 'jaws for .forcing the latter intoelamping engagement `with a tool inserted inthe chuck, a. movable member actuated by the 'tool in movinginwardly, and a second Y.

chuck, and a series off movable members disvconnected"from said body member and from said jaws and located toengage opposed por# tions of said body member and said jaws and operating when moved in one direction to :force saidjaws away" from said vbodyA member to cause said aws to grip the' tool,

said movable members being actuated iasv stated, the toolg in .moving inwardly lin the y 18. Av chuck comprising, in combination, `a body member, tool-clamping jaws thereon,` means for shifting saidjaws into'v clamping engagementwith a tool insertedv into the chuclga series of movable membersfdiscoiinected from said body-member and from"'said` jaws and locate-d to .engage opposed portionsl of said body member and said. -j` aws yand operating .when movedin one.direction to force said `jaws away fromsaid rbody member to cause said jaws togriprthe tool, and a plunger operatively engaging said 'movable mem?k bers and operating, when forcedninwardly by the tool in moving inwardly, to actuate said movable members to force said aws into tight engagement vwith, the tool.Y

@aan Aa..izan-Msaben. 'y 

